multiply SI units by tails

y/2/-/
s/^/m kg s A K mol cd/
:
s/\(\w\+\)\(.*\)\(\1\>-*\)/\3-\2/
t
s/\w\+ //g
s/--/2/g
s/2-/3/g
s/22/4/g
s/-\|\W*$//g

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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